Novak Djokovic remains set on more success after surpassing Steffi Graf's record for weeks spent at world number one.

On Monday, Djokovic celebrated a 378th week as the best player in men's tennis, which overtook the all-time record (for men or women) set by Graf.

Like Graf, Djokovic has won 22 grand slam titles, though the 35-year-old remains in the hunt for more glory.

After his Australian Open triumph earlier this season, Djokovic will be hoping a 94th ATP Tour-level title comes his way at this week's Dubai Tennis Championships.

"I still want more achievements," Djokovic said ahead of breaking Graf's record.

"I could not have imagined this, I was dreaming as a kid to be Wimbledon champion, to be number one in the world. I achieved those dreams in 2011.

"After that, I wanted more. Of course, I'm driven by the goals. I'm as dedicated to the sport really as anybody else.

"It's surreal in a way to be that many weeks at world number one, to match Steffi Graf, who is one of the all-time greats of our sport. Just being among these legendary names is flattering. I'm very proud."

Djokovic's campaign in Dubai starts against Tomas Machac on Tuesday.

Novak Djokovic has brought up his 378th week as world number one.

That sees the 35-year-old, 22-time grand slam champion overtake Steffi Graff as the outright record holder for the amount of weeks spent at the top of the world.

Djokovic won his first major in 2008, and has not looked back.

To mark his achievement, Stats Perform has used Opta data to run through the key numbers from Djokovic's stellar career.

ATP Tour titan

7 - Djokovic has been year-end number one on seven occasions, one more than Pete Sampras and two more than Roger Federer, Rafael Nadal and Jimmy Connors.

93 - Djokovic has won 93 ATP Tour titles. Only three players have won more in the Open Era.

1,249 - The Serbian has played 1,249 matches on the ATP Tour. Just Nadal (1,288), Ivan Lendl (1,310), Federer (1,526) and Jimmy Connors (1,558) have played more.

350 - Djokovic has featured against top-10 opponents 350 times, more than any other player in history. He has won 243 of these matches. 

A master at work

22 - Only Serena Williams (23) has more major titles in the Open Era than Djokovic, who is tied with Nadal for the most grand slam triumphs when it comes to men.

33 - Djokovic has played in 33 grand slam finals, the most by any male player in the Open Era. Only Chris Evert (34) has more when it comes to female players.

37 - He has won 37 per cent of the grand slam titles on offer since (and including) his maiden major success in Melbourne in 2008. Nadal has won 32 per cent (19/60) and Feder 13 per cent (8/60).

28 - No player has won more consecutive matches at the Australian Open than Djokovic (28), while he has won 28 straight at the Wimbledon, too.

10 - Djokovic is the first player to play a minimum of 10 semi-finals at each of the grand slams.

2 - After his 10th triumph at the Australian Open, Djokovic became the second male player in the Open Era to secure 10+ titles in a single grand slam, after Nadal (14 French Open titles).

38 - No player has won more ATP 1000 titles than Djokovic (38), Eleven of those titles were won without losing a set.

6 - Djokovic has won the most ATP 1000 titles won in a single season (six).

Nemesis Nadal

59 - Nadal is the player Djokovic has faced the most times in his career (59). The Spaniard has lost 30 of those matches, marking Djokovic's best win tally against a single opponent.

179 - Djokovic has faced players from Spain 179 times, winning 131 matches and losing 48.

29 - He has won 130 matches against left-handed players, losing 40. Of those 40 defeats, 29 were inflicted by Nadal.

100 - Djokovic has a 100 per cent record against four players: Gael Monfils (18-0), Jeremy Chardy (14-0), Milos Raonic (12-0) and Andreas Seppi (12-0).

Novak Djokovic is amassing such a dossier of evidence that no sober judge would dispute his claims, but debate still rages as to who is the greatest men's tennis player of all time.

The 35-year-old has now racked up 378 weeks at number one on the singles rankings, not only improving his record among the men but also this week going past Steffi Graf, the leader on the women's tour.

Djokovic has won 10 of the last 16 grand slams he has contested, all since turning 30, and has moved level with Rafael Nadal on 22 singles majors, the most ever captured by a man.

His stockpiling of Masters 1000 titles is bordering on being greedy, with a record 38 tucked away, and although he turns 36 in May there is no sign of Djokovic slowing down.

Tommy Haas snatched three wins from nine encounters with Djokovic, while the Serbian was going up through the gears early in his career.

Haas told Stats Perform he sees Djokovic as a player who wants to "end that debate" over who is the greatest, but there are good grounds to reason the man from Belgrade has already done enough.

Djokovic's compelling case

With plenty of miles left in his legs, Djokovic has already reached 33 grand slam finals (W22 L11), the most by any man. It puts him level with Serena Williams (W23 L10) and one behind Chris Evert (W18 L16), who is perhaps a surprising leader in this field.

Given his form in the past 12 months, it would be astonishing if Djokovic does not reach more slam finals this year.

He has also won 38 Masters titles – the next rung down from the grand slams – and is not just the only singles player to have won every one of these nine tournaments, he has won each one at least twice.

Djokovic's six end-of-season ATP Finals titles puts him level with Federer.

Adding together grand slams, ATP Finals crowns and Masters 1000 wins, Djokovic has 66 of these so-called 'Big Titles', seven more than Nadal, who sits second on the list. It bears pointing out the Masters events only began in 1990, so this puts players of the modern era at an advantage, but the domination of these events by the likes of Djokovic, Nadal and Federer mirrors their unprecedented grand slam supremacy.

Djokovic has an 83.5 per cent career win-loss record (W 1,043, L 206), the best of all players with at least 200 matches on tour during the Open Era (since 1968).

In the slams, his win-loss record of 341-47 gives Djokovic an 87.9 per cent winning record, just a shade behind Nadal's 88 per cent, and ahead of Federer (86 per cent).

Djokovic is rapidly closing in on overtaking Nadal's win percentage, having powered through his last 14 matches at the majors, triumphing at Wimbledon and the Australian Open.

These winning percentages at the slams by the Big Three are not the absolute highest of all time, but considering Djokovic, Nadal and Federer have regularly had to play one another over the past two decades, that is easily explained.

Only Bjorn Borg (71.1 per cent) has a higher win percentage against top-10 players than Djokovic's 69.4 per cent, but Borg's career was relatively brief, stepping off the tour in his mid-20s, with Djokovic a model of sustained excellence.

Djokovic is playing in Dubai this week, seeking more trophy success.

The expert's view

"He's the ultimate competitive warrior out there," says Tommy Haas. "He doesn't leave a stone unturned, does everything that he possibly can to be the best that he can be."

Haas is now tournament director at the Indian Wells Masters – aka the BNP Paribas Open – and he had better results than most against Djokovic, scoring wins on grass in Halle and Wimbledon in 2009 before repeating the trick on hard court in Miami four years later.

Djokovic, it can be argued, is a better player at 35 than he was at 25, and he is certainly more dominant. The man who feeds off his inner "wolf energy" has lost none of his bite.

"He's spoken about it himself many times, the sort of upbringing that he had, the experiences that he had to go through just to put so much grit in him, so much fire and fighting power. And you see it. The guy is an absolute beast out there," Haas said.

"There's no doubt in my mind that in his mind he wants to become the greatest of all time and win the most slams and end that debate and I think that's that's what he's looking to do.

"We're getting a little bit ahead of ourselves now but let's just say he does have the most slams. He's won every Masters series there is, maybe the most of all of them as well. Longest number one, most slams and then I think there is no room to argue."

Is winning enough to define greatness?

Yes. It has to be. In hand-to-hand combat, whether in war or something as relatively frivolous at tennis, it's all about getting the better of the enemy. Then it's about continuing to do so, and if it's easy on the eye, all well and good.

Roger Federer played the most sumptuous tennis that made him a bigger draw than anyone, and the Swiss great was also a sensational winner to boot, and a charmer, but Djokovic is picking off his records one by one.

Does this make Djokovic the most popular tennis player of all time? No, he rarely exhibits the warmth of personality that Federer brought, the crowd-pleasing flourishes are in shorter supply, and he brings some of the bad press and occasional crowd antipathy on himself.

But winning is the priority for Djokovic, and nobody does it better.

Haas says: "Really, can you say does he have the prettiest game or the best shot selection or this and that? Without Roger and without Rafa he would have been pushed to become that good of a player? Maybe not. And you have to always look at every generation pushing each other and all that stuff.

"And the debates can go on and on. Bjorn Borg retired when he was 26 years old, he won 11 slams. What if he would have played 10 more years? Yeah, he probably could have had 20."

But Djokovic has 22 and is hurtling towards Margaret Court's 24 slams, the most by a woman. There is no doubt he believes he can go beyond that, and keep going.

Shingo Kunieda won 28 wheelchair singles majors, and Djokovic might even get up towards that number.

For now, the number that matters is number one. Whether you like him or not, the man they call Nole is hurtling into history as the champion supreme.

Novak Djokovic claimed a share of yet more history on Monday as he started his 377th week as world number one.

Djokovic has won 22 major titles, the joint-most among men, and has long since held the record for the most weeks at the top of the ATP rankings.

His nearest rival on the men's tour – since the rankings were introduced in 1973 – is the now retired Roger Federer, who spent 310 weeks in top spot.

But Djokovic has also matched Steffi Graf, the WTA leader, in making it to 377 weeks.

Graf was the women's number one 45 weeks longer than second-placed Martina Navratilova (332), with Serena Williams in third (319).

The WTA rankings began in 1975.

Rafael Nadal is halfway to a calendar Grand Slam, a feat that would mark the crowning point of any player's career.

Yet the Spanish great does not have to look far back into history to see how quickly that dream can be scuppered, with Novak Djokovic having fallen agonisingly short of a sweep of all four majors only last year.

As perhaps the most grounded player in tennis, Nadal heads into Wimbledon well aware that winning the first two majors of the year is no guarantee of any future success.

At the age of 36, and with a foot problem that requires careful maintenance, it would be arguably the most remarkable feat in the Open Era if Nadal were to add the Wimbledon and US Open titles to his Australian Open and French Open triumphs.

Such dominance is scarce in tennis, and Rod Laver was the last player to scoop all four men's singles titles at the majors, all the way back in 1969.

Steffi Graf won all four on the women's side in 1988, and it seemed a knock-in that Serena Williams would do likewise in 2015 when she headed to the US Open with three majors already bagged.

But Williams famously came unstuck when she faced Roberta Vinci in the semi-finals, while Djokovic went even closer in 2021, losing to Daniil Medvedev in the final at Flushing Meadows.

Here, Stats Perform examines the daunting challenge of scooping all four slams consecutively.

WHAT THE GREAT CHAMPIONS SAY

Before tennis reached its Open Era, which marked the dawning of professionalism on the tour, Laver won his first calendar Grand Slam in 1962.

He said later, quoted by the Tennis Hall of Fame: "It was a thrill to come off the court knowing I had won all four majors in one year. But I never felt like I was the best, never felt that way. I just happened to have a good year."

His 1969 dominance came a year after Laver returned to the majors, following a five-year exile while he played professional tennis elsewhere. When the majors allowed professionals to compete alongside the amateurs, 'Rocket Rod' was again unstoppable.

Laver turned 31 in 1969 and did not win any further grand slam singles titles in his career after that astonishing season, but that second perfect season sealed his legacy as an all-time great.

Stefan Edberg won a boys' singles clean sweep in 1983, but Laver remains the only player to win the men's singles full set in a calendar year since American Don Budge captured all four in the 1938 season, the first time it was achieved by a man. Maureen Connolly and Margaret Court achieved calendar Grand Slams in women's singles in 1953 and 1970 respectively.

A non-calendar Grand Slam was accomplished by Djokovic, when he won Wimbledon, the US Open, Australian Open and French Open consecutively across the 2015 and 2016 seasons. Yet no man other than Laver, Budge and Djokovic has won all four singles crowns in succession.

It has been 11 years since Nadal himself went close. He went to the Australian Open in 2011 with the Roland Garros, Wimbledon and US Open trophies in the bag, looking to complete the set.

"I am sure it's going to be the only one opportunity that I'm going to have in my life," said Nadal that year. "I'm not going to have more of these opportunities to win all four in a row.

"I think it is almost impossible. It is very, very difficult, no? Tennis is a very competitive sport and there is not a lot of difference between players. So a lot of matches are decided in a few balls. So for that reason it is very difficult to have one player winning everything. That's the truth."

Nadal, hampered by injury, lost in the Melbourne quarter-finals to David Ferrer in 2011 and had not won back-to-back slams since, until this year's surprise double. 

REACHING PRESSURE POINT

It is too soon to think that Nadal has a glorious chance to land all four big ones this year. After all, although he has won Wimbledon twice before, those triumphs came in 2008 and 2010, and he has a chronic foot problem. He has required radiofrequency ablation treatment in the past fortnight, preventing nerves in his foot sending messages to his brain.

He fell to Djokovic in the 2011 Wimbledon final and has not been back to the title match since, suffering a run of disappointing early exits in London before reaching semi-finals in 2018 and 2019, his last visits to the tournament.

Djokovic is a heavy favourite for this year's title, but it would be bold to entirely rule out Nadal, particularly given that as the second seed he cannot run into Djokovic until the final. Particularly given that he is Rafael Nadal, and prone to doing stupendous things.

Serbian Djokovic, a year Nadal's junior, would be able to tell his great rival just how intense the strain can become when a calendar Grand Slam becomes a serious prospect.

Speaking in November last year, two months after Medvedev denied him in New York, Djokovic said: "I'm very relieved that the grand slam season was done, because I felt a tremendous pressure unlike anything I felt in my life.

"It was an interesting experience, and I'm very satisfied with the way I played in grand slams, three wins and a final. There are much more positive things to be grateful for and to look at than negative."

Like Djokovic, Serena Williams has managed the non-calendar Grand Slam before, with the American first achieving that from the French Open in 2002 to the Australian Open in 2003, and in 2015 she was aiming for five slams in a row when she arrived at the US Open, having begun her dominant streak at her home grand slam the previous year.

That would have meant Williams sealed each of the 2015 slams, and losing to Vinci led to stark frustration, underlined by a terse response to the question of how disappointed she felt by the result.

"I don't want to talk about how disappointing it is for me," Williams said. "If you have any other questions, I'm open for that."

Sometimes, players get ahead of themselves when looking at the season ahead, and Naomi Osaka had a calendar Grand Slam in her thoughts after winning the season-opening Australian Open in 2019.

She had also triumphed at the US Open at the end of 2018, and the Japanese star was beginning to think she might enjoy an invincible year at the majors, only to stumble to a third-round French Open defeat to Katerina Siniakova.

Osaka said: "I think I was overthinking this calendar slam. For me this is something that I have wanted to do forever, but I have to think about it like if it was that easy, everyone would have done it."

Novak Djokovic has leapt from one bubble into another as he attempts to become the first man in tennis history to win all four grand slams and Olympic gold in the same year.

The only men to have won each of the singles majors across their careers, plus Olympic gold, are Andre Agassi and Rafael Nadal, and now Djokovic aims to move to the brink of winning all five in his remarkable 2021 season.

Fresh from dominating at Wimbledon, and with the Australian and French Open titles already in the bag, Djokovic heads into the Tokyo Games as a red-hot favourite, seeking to set himself up to complete a historic campaign at the US Open.

Naomi Osaka will enter the Games with almost as much expectation behind her too, the reigning US Open and Australian Open champion eyeing glory for hosts Japan.

But tennis has thrown up a host of shock results in its short Olympic history. Here, Stats Perform looks at the sport's place in the Games.

WHO'S IN, WHO'S OUT, AND WHAT DOES ALL THIS MEAN?

Serena Williams, Roger Federer and Rafael Nadal have all opted out of the Olympics.

Williams made her mind up prior to suffering a leg injury at Wimbledon, although she is already a member of the career Golden Slam club.

Federer reached his decision after revealing he also suffered a physical setback at the All England Club, and Nadal elected to take a two-month break after relinquishing his French Open title.

Don't expect to see them again at the Olympics, given Williams and Federer will be pushing 43 by Paris 2024, and Nadal will be 38. Federer won a doubles gold with Stan Wawrinka in 2008, but his singles peak was the silver medal he earned in 2012, Andy Murray crushing Swiss hopes in the final at Wimbledon.

Dominic Thiem, Bianca Andreescu, Nick Kyrgios, Simona Halep, Angelique Kerber, Victoria Azarenka and Denis Shapovalov are among other confirmed absentees, with fitness issues a factor for some, less so for others.

The COVID-19 crisis is a mitigating factor in why so many stars are staying away, and directly responsible in the case of some players, such as Britain's Johanna Konta and Dan Evans, who both tested positive recently.

But tennis was only fully restored to the Olympic programme in 1988, after being dropped post 1924, and if players are seen to be favouring the grand slams over the Games, that is not such a great look for the sport.

At a time when the International Olympic Committee has shown it is willing to shake up the sports on its programme, tennis could perhaps do with a headline-making Tokyo 2020.

Murray, the two-time defending men's champion, will target an improbable hat-trick. A hat-trick for the injury-hit former world number one would be a sensation, and Osaka landing gold in the women's tournament would surely be one of the great moments of the Games.

DJOKOVIC FOLLOWING IN THE FOOTSTEPS OF GRAF

When Steffi Graf beat Gabriela Sabatini in the women's singles final at Seoul, it completed what we know now as the calendar 'Golden Slam'. She had already won the Australian Open, French Open, Wimbledon and the US Open, and the feat of the then 19-year-old West German has yet to be repeated.

Now Djokovic is three-fifths of the way to a similar clean sweep of the majors and the Olympics, with the US Open getting under way on August 30 in New York.

He teetered on not going to Tokyo, and perhaps he is to some extent endangering his chances at Flushing Meadows by spending more time travelling and enduring bubble life, while others rest up.

But Djokovic is a fiercely proud Serbian and could not resist a great chance of winning gold for his country. He landed bronze at the 2008 Games in Beijing but in 2012 he lost to Juan Martin del Potro in the bronze-medal match, and a cruel draw at Rio four years later saw him assigned Del Potro in the first round.

Top seed Djokovic bowed out in two tie-breaks to the powerful Argentinian, describing the outcome as "one of the toughest losses in my career".

There is no danger of a hat-trick of defeats to Del Potro, which may help Djokovic. Del Potro has been battling for two years to get back to fitness, undergoing four rounds of right knee surgery in a bid to get back on tour.

RAISING THE BAR AT THE OLYMPICS

How the Olympic village functions in Tokyo will be distinctly different to at previous Games, given the pandemic restrictions in place that could be a real buzzkill.

But in the past there have been countless cases of athletes becoming inspired by their surroundings and going on to perform above their usual level.

It can be a party village, and it can also be an eyebrow-raising experience as global superstars rub shoulders with competitors who might struggle for recognition in their home towns. More than anything, the shared team experience, fighting for a collective cause, can make a middling athlete believe they can be great.

Monica Puig was a massive tennis outsider in 2016 but the then world number 34 won the women's singles, stunning Angelique Kerber in the final after beating Petra Kvitova and Garbine Muguruza en route. That gave Puerto Rico their first ever Olympic gold medal.

In 1992, a tournament that featured the likes of Pete Sampras, Jim Courier, Stefan Edberg and Boris Becker finished with a staggering final match-up of Marc Rosset versus Jordi Arrese, who in his home city of Barcelona was edged out 8-6 in the fifth set by the Swiss world number 43. Nobody would have predicted that head to head for gold.

Similarly, at Athens 2004, Nicolas Massu beat Mardy Fish in the gold medal match of a tournament that featured Federer, Andy Roddick, Carlos Moya and Tim Henman.

In the 1996 Atlanta Games, Lindsay Davenport, who had just turned 20, took inspiration from being the daughter of an Olympian, with dad Wink having played volleyball for the United States at Mexico City in 1968.

Davenport was beginning to make an impact on the WTA Tour but was only the ninth seed at the Olympics, yet she swept through the rounds before sinking Arantxa Sanchez Vicario 7-6 (10-8) 6-2 in the final.

"It's like one of those things I look back on and I'm like, 'Was that me?'," Davenport told The Tennis Podcast last year.

"It doesn't seem like it was real. I'd made the transition to the pro tour pretty well, but I liked hanging out between eight and 16 in the rankings. I was very insecure, unsure of what could I do. I liked doing well but I wasn't sure I wanted to do too well because it seemed really overwhelming to be one of those top players.

"Here I go at 20 years old to Atlanta for two or three weeks, in a setting that seemed so comfortable. Look at all these athletes, you have all different shapes and sizes, you have players that are really working hard but have so much in common and you get to hang out with them, breakfast, lunch, dinner in the village."

Davenport was a future world number one and three-time grand slam singles champion, but at this point in her career being an American at an Olympics in the United States was just a thrill.

"You're sharing this with your team-mates who are some of my best friends in Mary Joe Fernandez, Monica Seles. It was the best time ever," she said.

"By the time the tournament actually started we were like, 'Yeah, I'll go play my match and then we'll go back to the village and we'll hang out', and everything went so fast in those few weeks.

"And there I was left standing, winning at the end because I was so incredibly happy and excited with everything that was going on. I kind of forgot what was my job.

"When it became a reality of even just making the team in '96, it was so huge also for my family with having a second generation Olympian."